We took a chance on Casanis, even after a disappointed chowhound gave a negative report. We had a different experience.
The room is indeed fairly standard French bistro, but I liked the low lighting (unlike, say, Schiller's). And speaking of lighting, they had very attractive long retro-looking lights on the ceiling. Hard to describe. But we liked the vibe of the place. Only a few tables were occupied, and a couple more came in while we were there. No sign of the DJ booth that the earlier poster mentioned.
As for the food, I was pleasantly surprised by my crispy-skinned salmon over lentil salad. Pretty basic fare, but executed well. My boyfriend had what seemed an unusual pairing: tuna steak over pasta puttanesca. But it was tasty and worked together. We had a couple of glasses of malbec that I found to be drinkable but that's about it.
The service from our (French) waiter was friendly and efficient, no complaints there. They only have a few desserts, but he said they'll be expanding their offerings soon.
It's not a place to travel for, but I'm glad to have a spot like that in the neighborhood. (Corner of Broome & Ludlow).